Valve-gear.



No. 707,995. v Patented Aug. 26, 1902.

H. WHITE & w. a. TAYLOR.

VALVE GEAR.

lAppliuution filed Sept. 28, 1901.)

(No Model.)

2 Sheets8jhe et L I Q! a: l- I I l 4 a I I 2 4 I all autumn;

TNE Nonms w'z-rsns c0. Pnwauma, WASHINGTON. 04 c.

Patented Aug. 26, I902.

H. WHITE &. W. G. TAYLOR.

VALVE GEAR.

Application filed se t.' 28. 1901.

2 Sheets-Shea? 2.

(No Model.)

I "m: dams Pzrzns co.. Puufom 'na. WASHINGTON, n. c.

UNITED STATES PATENT OFFICE.

HENRY WHITE AND WILLIAM G. TAYLOR, OF MARION, OHIO, ASSIGNORS OF ONE-THIRD TO ZAOHARIAH TAYLOR SILVIS, OF GREENSBURG, PENNSYLVANIA, AND HARRY J. SILVIS, OF MANSFIELD, OHIO.

VALVE-G EAR.

SPECIFICATION forming part of Letters Patent No. 707,995, dated August 26, 1902. Application filed September 28, 1901. Serial No. 76,943. (No model.)

objects of our improvements are, first, to construct a valve-gear that will reverse the motion of the engine and maintain the relative travel of the valve irrespective of the direction in which the engine is to run; second, to

provide a valve-gear by means of which the admission of steam to the cylinder can be regulated to correspond with the power required;

third, to afford facilities for transmitting a uniform travel to the valve-gear withoutreference to the direction in which the engine is running; fourth, to provide a means of constructing a reversing valve-gear that is simple, convenient, and efficient in operation.

We attain these objects by the mechanism illustrated in the accompanying drawings, in which- Figure 1 is a view in side elevation of the valve-gear, showing it connected to the eccentric and valve. Fig. 2 is a side detail view in perspective of one of the eccentric-guides.

Fig. 3 is a detail perspective view of the eccentric-strap. Fig. 4 is an end view of the eccentric strap and guide, showing the construction of the bearing. Fig. 5 is a vertical section showing the eccentric-yoke and its means of attachment to the connecting-rod. Fig. 6 is a detail view, in vertical cross-section, of the valvegear, showing the reversing-guides, strap, and eccentric-yoke attached to the en gine-shaft and eccentric. Fig. '7 is a detail view in perspective of one bar. Fig. 8 is a side elevation of one ofthe reversing-guides. Fig. 9 is a view in side elevation of the valvegear, showing its construction modified and adapted to be operated by means of a rockerarm. Fig. 10 is a view in perspective of the rocker-arm and the sliding block embraced thereby.

Similar numerals refer to similar parts throughout the several views.

The ends 1 of the crank-shaft are turned smaller in diameter than the center portion, leaving the face of the shoulders 2 2 in contact with the inner edges of the pillow-blocks, (not shown in the drawings,) thereby preventing end play. An eccentric 3 is fitted and attached rigidly by means of set-screws or other suitable means to the crank-shaft. An eccentric-strap 4 is fitted to the periphery of the eccentric and is provided with tracks or ribs 5, which correspond with the tracks or grooves 6, formed inthe eccentric-guides. (See Fig. 2.) In the periphery of the eccentric-guides a groove 7 is formed, into which a yoke 8.is fitted and attached to the connecting-rod 9, thereby providing a means to retain the guides in place and in contact with the eccentric-strap when motion is imparted to it by the eccentric. The connecting-rod 9 is pivotally connected to the free end of the valve-stem 10 by means of the pivot-bolt 11 at one end. The opposite end of the rod 9 is connected to the projecting end 21 of the yoke,

the end of the rod being inserted in a slot 22, formedin the block 23, which is provided for the purpose of taking up'wear and maintaining a true circle on'the inside diameter of the yoke. Bars 12, having their edges dovetailed,-

are bolted to (or cast integral with) each side of the eccentric-guides 7, forming ways for the reception of the reversing-guides 13. The reversing-guides have their edges dovetailed to correspond with the dovetail in the ways It is obvious that the dovetail can be dispensed with and bolts 31 used in place thereof to connect the reversirigguides. The reversingguides are fitted to rock or oscillate on the crank-shaft. The upper portions 14 of the guides extend inwardly a distance equal to one-half of the width of the eccentric, eccentric-strap, and eccentric-guides. A groove or slot 15 is formed in the upper portions of the reversinguides, the slot formed partly in one, partly in the other of the guides, and is adapted to receiveone end of the reversinglever rod 16, the opposite end of which is pivotally connected to the reversing-lever 17. The quadrant 18 is attached by means of a bracket 19 to any part of the engine or boiler and is equipped with the ordinary reversinglever 17 and spring-catch 20.

The operation of our reversing valve-gear is as follows: The eccentric transmits motion to the eccentric-strap, giving it a reciprocating rectilinear motion, permitting the eccentric-strap to reciprocate backward and forward freely on the tracks 5 and 6 between the eccentric-guides and at the same time transmitting an upward-and-downward motion to the eccentric-strap and yoke through the medium of the reversing-guides. The reversingguides are controlled by the reversing leverrod and reversing-lever, which are connected to the reversing-guides. The direction of the rotation of the engine can be changed by moving the reversing-lever backward and forward. This changes the angle of the reversing-guides and modifies the travel of the valve. The connecting-rod, yoke, and eccentric-guides are connected to the reversingguides by means of ways. They are thereby forced to move over the reversing-guides at any angle desired. The admission of steam can be cut off at any point of the stroke of the piston, either on the backward or forward motion, by changing the angle of the reversing-guides through the medium of the reversing-lever. The engine can be stopped by placing the reversing-lever in the center notch of the quadrant.

A modification of our invention is shown in the drawings in Figs. 9 and 10. The construction is the same except the reversingguides and eccentric-strap guides are dispensed with, and the eccentric-strap is reciprocated within a yoke 32, which is rectangular in form, with rounded ends. The inner surface 25 of the upper side of the yoke is tapered to conform to the shape of a wedge 26, the purpose of which is to take up the wear of the eccentric-strap. A rocker-arm 33, rectangular in form with one side open, is pivotally attached to any convenient part of the engine or boiler. The upper end 28 is attached to the reversing-rod 16. A block 29 is attached to the side of a block 23 and is adapted to fit and reciprocate in the rocker-arm, between the edges 30 of the rectangular portion of the rocker-arm. When the angle of the rocker-arm is changed by moving the reversing-lever backward or forward, the block is forced to travel in the direction of the angle of the rocker-arm, thereby changing the rotation of the engine or cutting off the steam, as desired.

What we claim as our invention, and desire to secure by Letters Patent, is

1. A valve reversingand stopping gear comprising an eccentric, an eccentric-strap surrounding the eccentric, the eccentric-strap adapted to reciprocate with relation to the guides, tracks formed on two opposite sides of the strap, guides located on two opposite sides of the eccentric-strap, the tracks adapted to be received in the guides,whereby the strap reciprocates between the guides.

2. A valve-reversing gear comprising a shaft, an eccentric on the shaft, a strap surrounding the eccentric, guides located on opposite sides of the eccentric-strap between which guides the strap is adapted to reciprocate, bars connecting the guides, the bars located outside the plane of travel of the straps, reversing-guides pivoted on the shaft outside the plane of travel of the eccentric-strap, the reversing-guides received between the bars which constitute guides therefor, and means for swinging the reversing-guides upon the shaft as a center whereby to vary the direction of reciprocation of the eccentric-strap.

3. A valve-reversing gear comprising a shaft, an eccentric rigidly secured thereon, an eccentric-strap surrounding the eccentric, eccentric-guides located on opposite sides of the strap, tracks formed upon the contiguous edges of the strap and guides,the tracks adapted to register with one another whereby the strap is permitted a reciprocatory movement between the guides and a yoke surrounding the guides and eccentric -strap, the yoke adapted to retain the members in position with relation to each other.

4. A valve-reversing gear comprising a shaft, an eccentric mounted thereon, an eccentric strap surrounding the eccentric, guides between which the strap is received and reciprocates, a yoke surrounding the eccentric, eccentric strap and guides, a connecting-rod to which the yoke is attached, reversing-guides pivoted on the shaft, means connecting the eccentric-guides, between which the reversing-guides are received whereby the reversing-guides are enabled to change the direction of reciprocation of the eccentricstrap and means for swinging the reversingguides.

5. A valvereversing gear comprising a shaft, an eccentric mounted thereon, a strap surrounding the eccentric, ribs formed on opposite sides of the straps, grooved eccentricguides between which the strap is received and is adapted to reciprocate, the ribs received in the grooves, a yoke surrounding and retaining the eccentric-guides in place, the yoke received in grooves in the guides, reversingguides pivotally mounted on the shaft, means on the eccentric-guides between which the reversing-guides are received means for rocking the reversing-guides on the shaft whereby a partial revolution is given the eccentricguides in the yoke,the reversing-guides adapted to regulate the direction of motion of the eccentric-strap in this manner.

6. The combination with a valve-reversing gear, of an annular yoke, a pair of oppositelydisposed segmental eccentric-guides located within the circle embraced by the yoke, a rectangular eccentric-strap located in the space between the two guides, the strap adapted to reciprocate therebetween,an eccentric,a shaft to which the eccentric is keyed, the eccentric inclosed by the eccentric-strap, apair of reversingguides journaled on the shaft on either side of the eccentric, means for retaining the reversing-guides in fixed relation to the eccentric-guides, a connecting-rod removably secured to the yoke, avalve,a valvestem, the outer end of which is pivotally secured to the free end of the connecting-rod and means for rocking the reversingeguides on the shaft to reverse the ad mission-point of the steam and to stop the engine.

7. A valve-reversing gear comprising a shaft, an eccentric secured on the shaft, an eccentric-strap surrounding the eccentric, guides between which the strap is received and reciprocates, a yoke surrounding the guides to retain the parts in position, reversing-guides pivotally mounted on the shaft, the reversin g-guides adapted to vary the direction of travel of the eccentric-strap, a connectingrod secured to the yoke, a valve-stem pivotally secured to the rod, the movement of the valve-stem regulated by the direction of movement of the eccentric-strap whereby a greater or lesser amount of steam is admitted to the cylinder of the engine.

8. A valve-reversing gear comprising a reciprocating member, oscillating means between which the reciprocating member moves, means for varying the direction of movement of the reciprocating member, a yoke surrounding the reciprocating member and the oscillating means between which it moves, a rod secured at one end to the yoke, a valve-' stem pivotally secured to the opposite end'of the rod, the movement of the valve-stem regulated by the direction of movement of the reciprocating member whereby to govern the amount of power admitted by the valve on the valve-stem to the engine-cylinder.

9. A valvereversing gear comprising a shaft, an eccentric secured thereon, an eccentrio-strap received upon and surrounding the eccentric, ways formed in opposite sides of the strap, segmental guides between which the strap is received and reciprocates, the segmental guides provided'with grooves on their straight edges in which are received the ways on the strap, a yoke in which the segmental guides are received and inclosed, the yoke received in grooves on the arc-shaped edges of the segmental guides, reversing guides pivotally mounted on the shaft on either side of the eccentric, bars secured to and connecting the segmental guides, the reversing-guides received between and contacting with the bars, and means whereby the reversingguides, and segmental guides are swung in'the arc of a circle to vary the direction of reciprocation of the eccentric-strap.

10. A valve reversing gear comprising a shaft, an eccentric secured thereon, an eccentric-st-rap receivedupon and surrounding the eccentric, ways formed in opposite sides of the strap, segmental guides between which the strap is received and reciprocates, the segmental, guides provided with grooves on their straight edges in which are received the ways on the strap, a yoke in which the segmental guides are received and inclosed,-the yoke received in-grooves onthe arc-shaped edges of the segmental guides, reversing-guides pivotally-mou nted on the shaft on either side of the eccentric, a plurality-of bars secured to each side of and connecting the segmental guides, the reversing-guides fitted between the bars,

levers,.rods connecting the reversing-guides and the levers whereby the reversing-guides may be moved to any angular position to swing the segmental-guides in the yoke whereby to give a direct angular direction of reciprocation to the segmental guides and eccentricstrap.

11. A valve-reversing gear comprising-a shaft, an eccentric secured thereon,'an eccentric-strap received-upon and surrounding the eccentric,eccentric segmental guides between which is received'and reciprocates the eccen trio-strap, the guides provided with grooves on their peripheries, a yoke seated in the grooves and inclosing the guides, bars secured to and connecting the guides, the bars located on either side of the guides, reversing-guides pivoted on the shaft andreceived between the bars and means for rocking the reversing-guides in the arc of a'circle.

12. A valve-reversinggear-comprising a- .shaft, an eccentric secured thereto, an eccentric-strap on the eccentric, tracks on' the strap,guides with a groove formed in the periphery thereof, the strap received and recip rocating'between the guides,'a yoke surrounding the guides and "received in the groove, and movable reversing-guides adapted to guide the travel of the eccentric-strapto maintain a direct angular travel, whereby the relative travel of the valve is the same on the direct or reverse motion.

Signed by us at Mansfield, Richland county, Ohio, this 26th day of August, 1901.

HENRY WHITE. c WILLIAM G. TAYLOR.

Witnesses:

LINooLN WHITE, JOHN WHITE.

IIO 

